Siemens SIMATIC - Page 385

Analog modules
6.9 Analog input module SM 331; AI 8 x RTD; (6ES7331-7PF01-0AB0)
S7-300 Module data
Manual, 06/2017, A5E00105505-AJ
385
Technical specifications
Temperature error (in relation to input range)
• Resistance thermometer
• Resistor
± 0.015 °C/K
± 0.005 %/K
Linearity error (referenced to input range)
• Resistance thermometer
• Resistor
± 0.2 °C
± 0.02 %
Repeat accuracy (in steady state at 25 °C, referenced to input
range)
• Resistance thermometer
• Resistor
± 0.2 °C
± 0.01 %
Status, interrupts, diagnostics
Interrupts
• Hardware interrupt
• Diagnostics interrupt
Configurable (channels 0-7)
Configurable
Diagnostics function
• Group error display
• Diagnostic information can be read
Configurable
Red LED (group error)
possible
Encoder selection data
Input range (rated values) input resistance
• Resistance thermometer
• Resistor
Pt 10, Pt 50, Pt 100, Pt 200, Pt 500, Pt 1000,
Ni 100, Ni 120, Ni 200, Ni 500, Ni 1000, LG-Ni
1000, Cu 10, Cu 50, Cu 100 (standard and climatic)
150, 300, 600 Ω
Permissible input voltage at voltage input (destruction limit) 35 V DC continuous 75 V DC for max. 1 s (duty
cycle 1 : 20)
Wiring of the signal transmitters
• for resistance measurement
with 2-wire connection
with 3-wire connection
with 4-wire connection
with 40-pin front connector
possible
possible***
possible
Characteristic linearization
• Resistance thermometer
• Technical unit for temperature measurement
Pt 10, Pt 50, Pt 100, Pt 200, Pt 500, Pt 1000,
Ni 100, Ni 120, Ni 200, Ni 500, Ni 1000, LG-Ni
1000, Cu 10, Cu 50, Cu 100 (standard and climatic)
Degrees Celsius / degrees Fahrenheit
* The resistance test for compensation of the line resistances with a 3-wire connection is performed every 5 minutes.
** Wire break monitoring in 4-channel mode (hardware filter) is performed every 3 seconds.
*** The maximum line resistance with 3-wire encoder measurements for the RTD elements PT 10 and Cu 10 is 10 Ω. For
all other RTD elements, the maximum power resistance for 3-wire encoder measurements is 20 Ω.
**** In 4-channel mode, the converted value settles to 100% within 80 ms. The value determined in this process is
switched typically every 3.3 ms (max. 10 ms).